JPS5874411A - Roller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller, in particular a transport roller, having an axis and a tubular peripheral wall, the peripheral wall being mounted at or near an outer end. It is of the type that is fixed on the shaft using an elastic bushing.

Known structure (Federal Republic of Germany Patent Application No. 2344
No. 236), the elastic bushing consists of two concentric rings, between which an elastic molding is inserted. For example, between the outer ring and the peripheral wall or between the inner ring and the shaft,
Non-rotatable and non-slidable connections are produced by press connections, shrink-water connections, keyway connections, wedge connections or adhesive connections that are resistant to shear forces.

This construction is used on rollers that are exposed to heavy loads, such as roller tables in rolling mills. Due to this construction, the jacket wall can be deflected slightly radially relative to the axis in the event of a shock load, so that the bearings are advantageously loaded and the rollers are exposed to slight wear.

Textile products 1. Transport rollers used, for example in copying machines 1, for transporting or guiding route material or paper webs or sheets are 1. It does not receive large loads like the rollers with the above-mentioned structure.

On the other hand, it is desirable that the rollers in printing machines, printing machines, textile machines, sheet processing machines, etc. be light. This is because in these devices periods of rest and periods of motion often alternate rapidly. Furthermore, it is submitted that 5 these machines must be light and inexpensive.

Known conveyor rollers used in machines such as grass are each 7"L with a journal at the outer end of the peripheral wall.
A plug is welded and turned from the solid material and can only be produced with corresponding machining and waste costs. In order to obtain the correct centering of the journal with respect to the circumferential wall, precise machining of the circumferential wall ends and plugs is required; therefore, the manufacture of these conveyor rollers is highly labor intensive and requires a corresponding "this construction". Construction is expensive.

The object of the invention is to provide an inexpensive and robust roller that is particularly suitable for use as a transport roller in copying machines and the like.

In order to solve this problem, starting from the roller mentioned at the beginning, the bushing as a whole is designed to have a spring action in the radial direction (4) and is tightened both in the circumferential wall and on the shaft. I would like to suggest that.

According to an embodiment of the invention, there are provided tensioning bushings, each bushing being mounted on a shaft, tensioning bushings being mounted concentrically in the peripheral wall with respect to the tensioning bushings, and It consists of an im-ring inserted between the fastening bushes of the.

Such fastening bushings are commercially available in different sizes9, so that no costly machining is required to produce these fixed parts! It is. The clamping bushing is made of spring steel and is segmented in the longitudinal direction. In the case of a tightening bushing, it is provided with a guide edge with a chamfered inner surface to facilitate mounting on the shaft. In tension bushings, a chamfered guide edge is provided on the surface of the outer shell to facilitate installation into the bore. In addition, the slit in the tensioning bushing must have a certain width in order to allow the tensioning bushing to be adjusted to a slightly smaller diameter when inserted into the hole. A bushing is different from a tension-tight bushing.

If the outer diameter of the tension bushing is relatively small,
It can be called a tightening pin.

The tension bushing is selected and defined so that its outer diameter is also slightly larger than the inner diameter of the circumferential wall. The tightening bushing is selected such that its inner diameter is slightly smaller than the diameter of the shaft, so that the tightening bushing is pushed onto the shaft by its radial spring force after being fitted over the shaft. Tightened.

By reducing the diameter of the tensioning bushings and enlarging the diameter of the tensioning bushings, a radial pressing of the imprinting ring mounted between these tensioning bushings takes place. This provides a good connection between the two tightening pushers.

Also, if the torque to be transmitted is large,
The rubber ring can be vulcanized and fixed to the tightening bush.

By using a spring-action clamping bush and a rubber ring, no high requirements are placed on the dimensional tolerances of the shaft and the jacket, so that for example commercially available tubes can be used for the jacket. This has a very positive impact on the cost of the roller according to the invention.

The force required to attach the tightening bushing is less than that required for press-fitting a rigid bushing.

The bushing may have a corrugated configuration in cross section, so that the outwardly directed corrugation crests touch the inner wall of the jacket and the inwardly directed corrugation crests contact the axis. Each of these bushes is i
It is possible to have three or so, - nine or more waves.

The dimensions of this bushing are selected as follows.

That is, the maximum outer diameter determined by the outwardly directed wave crests (7) is slightly larger than the inner diameter of the circumferential wall and/or the minimum inner diameter determined by the inwardly directed wave crests is less than the shaft diameter. is also slightly smaller.

After mounting the bushing, it is then pressed both against the inner wall of the circumferential wall and against the shaft.

Assembly can be facilitated by providing the circumferential wall and the shaft with chamfered guide edges or by chamfering the crest of one of the outer ends of the bushing. In this embodiment of the IC according to the invention, the desired tightening can be achieved by using only one member. It is, of course, within the scope of the invention to fill the remaining gap between the jacket wall and the bushing and/or between the shaft and the bushing completely or partially with a corresponding molded rim.

Instead of a concentric clamping bush, it is also possible to mount a ring of clamping pins between the circumferential wall and the shaft and 11'. The diameter of this clamping bolt is selected to be slightly larger than the width of the annular gap between the circumferential wall and the shaft. In this case, the circumferential wall is connected directly to the shaft by means of a clamping pin (8), so that when concentric clamping bushes are used, there is no need for a comb ring which connects these clamping bushes to one another. Can be held at the same distance from each other by a retainer6
More than one bin can be used.

The invention will now be described in detail with reference to the drawings.

The conveying roller 1 has a tubular peripheral wall 2 and a shaft 3.

This peripheral wall 2 has a tensioning bushing 4 mounted in the peripheral wall 2, a tensioning bushing 5 mounted concentrically on the shaft 3 with respect to this tensioning bushing 4, and a tensioning bushing 4 mounted on the shaft 3. It is fixed on the shaft 3 by a rubber ring 6 which is tightened between and 5.

The longitudinal slits 7 of these commercially available clamping bushes 4 and 5 can extend parallel to the longitudinal axis of the shaft 3 (FIG. 3a) or at an angle to the longitudinal axis of the shaft 3. It may be positioned (FIG. 3b) or otherwise extend in a hogogram (FIG. 3c) or in an undulating manner (FIG. 6d).

The imm ring 6 is pushed into the tension bushing 4 and the tension bush 5 is pushed into the imm ring 6. The two objects so constructed are then press-fitted onto the shaft 3 using a press and into the circumferential wall 2;
Ru. In this case, the shaft 3 and the sleeve 2 have already been fixed to each other in the correct position. Therefore, one similar fastening element is attached to both outer ends of this peripheral wall 2 at the same time.

An imm ring 6, which is sandwiched radially between the two clamping bushes 4 and 5 during this installation, ensures a good connection between the bushings 4 or 5, which are clamped in the peripheral wall 2 or on the shaft 3. This connection therefore makes it possible to transmit moments from the peripheral wall 2 onto the shaft 3 or vice versa.

Large tolerances can be tolerated by the spring-action connection with the sleeve 2, so that commercially available tubes can be used for the jacket 2 and the shaft 3 manufactured in such a way that it applies, for example, in a pure press fit. There is no need to take special accuracy into account. .

In the embodiment according to FIG. 4, a corrugated bushing 8 made of spring steel is used.

This bushing 8 has four waves and is designed as follows. That is, after assembly, the radially outwardly directed wave crests 9 are clamped to the inner wall of the jacket 2 and the radially inwardly directed wave crests 11 are clamped to the shaft 3.

It is also conceivable to use a corrugated bushing having, for example, six corrugations. The inner and/or outer corrugations of the bushing may be filled with rubber.

In the embodiment according to FIG. 5, four clamping pins 12 are arranged in a ring in an annular gap 11 between the circumferential wall 2 and the shaft 3. In the embodiment according to FIG.

The diameter of the tightening ring 12 should be adjusted to obtain the desired tightening.
In the unfilled state, the width of the annular gap 110 is also slightly larger. The clamping pins 12 are held at equal distances from each other by a retainer (not shown) made of plastic, in which case the clamping pins 1
The retainer bar, which engages in the slot of 2, prevents the clamping pin 12 from pivoting about its own solid axis. The strips of this retainer are positioned such that the radial center plane of each slit of the clamping pin 12 touches a circle determined by the center radius of the annular gap 11.

The invention allows rapid assembly using inexpensive fastening means. By using bushings 3, 4 or 8 or 12 with radial spring action, it is not necessary to maintain precise dimensional tolerances. Since the connection between the peripheral wall 2 and the shaft 3 is slightly flexible in the radial direction, the roller 1 has a corresponding Q
- When working with rollers, it is important to obtain equal line contact between both rollers over their entire length.

can.　　　　′

[Brief explanation of drawings]

The drawings show a plurality of embodiments of the roller according to the present invention, and FIG. 1 is a perspective view showing a part of the conveying roller before assembly, and FIG. 2 is a left side view of the conveying roller after assembly. Perspective views of longitudinal cross-sections of the two halves, Figures 6a, 6b, and 6c
6d and 6d are side views of different embodiments of the tightening bushing, FIG. 4 is a perspective view of the left half of a further embodiment of the conveying roller in vertical section, and FIG. FIG. 3 is a cross-sectional view of another embodiment. 1... Conveyance roller, 2... Peripheral wall, 3□... Shaft, 4
...Tension tightening bushing, 5...Tension tightening bushing,
6...Rubber ring, 7...Vertical slit, 8...
・Bush, 9, 10... Wave crest, 11... Annular gap, 12... Tightening pin agent Patent attorney Toshio Yano

Claims (1)

[Claims] 1. A roller having a shaft and a tubular peripheral wall, the peripheral wall being an elastic crystal bushing mounted at or near the outer end. The bushing is of the type that is fixed on the shaft using a tightening bushing (5), each bushing being mounted on the shaft (3), concentrically with respect to said tightening bushing (5); Tensioning bushings (4) installed in the peripheral wall (2) and these fastening bushings (4',
2. The roller according to claim 1, comprising a rubber ring (6) inserted between the rollers (5). 6. The bushing (8) has a corrugated cross-section, and the radially outwardly directed wave crests (9) are in contact with the inner wall of the circumferential wall (2) and are radially inwardly directed. Roller according to claim 1, characterized in that the wave crest (10) is in contact with the shaft (3). 4. Roller according to claim 1, wherein said bushings each consist of a ring formed by a slotted pin (12) between the circumferential wall (2) and the shaft (3).